Earlier quoted context omitted.
> Get a CGM for two weeks and find out what foods spike your blood sugar the most Are you in the US, and is it possible to obtain a CGM without a prescription?
Yes! Abbott Lingo (iPhone only for now) and Dexcom Stelo. They go for about $45 per sensor that last for 2 weeks. I second the OP's suggestion. It's completely changed my eating habits.
Do you have any tips for how to start with one and systematically get the most insight out of it?